X-Git-Url: https://git.cryptolib.org/?p=avr-crypto-lib.git;a=blobdiff_plain;f=scal%2Fscal-basic.c;fp=scal%2Fscal-basic.c;h=441a88c99623132fc073f22c315fca6543cfcdd2;hp=0000000000000000000000000000000000000000;hb=66c915087d1f7b8eb7280be43c16e9588faf2e55;hpb=3f759a542ce8ba4ffbeb6d336a3557a8abbd3ad4

diff --git a/scal/scal-basic.c b/scal/scal-basic.c
new file mode 100644
index 0000000..441a88c
--- /dev/null
+++ b/scal/scal-basic.c
@@ -0,0 +1,164 @@
+/* scal-basic.c */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2011  Daniel Otte (daniel.otte@rub.de)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <avr/pgmspace.h>
+#include "streamcipher_descriptor.h"
+#include "keysize_descriptor.h"
+
+uint8_t scal_cipher_init(const scdesc_t* cipher_descriptor,
+                         const void* key, uint16_t keysize_b,
+                         const void* iv,  uint16_t ivsize_b, scgen_ctx_t* ctx){
+	ctx->buffer = NULL;
+	ctx->ctx = NULL;
+
+	if(!is_valid_keysize_P((PGM_VOID_P)pgm_read_word(&(cipher_descriptor->valid_keysize_desc)), keysize_b)){
+		return 1;
+	}
+	if(!is_valid_keysize_P((PGM_VOID_P)pgm_read_word(&(cipher_descriptor->valid_ivsize_desc)), ivsize_b)){
+		return 2;
+	}
+	uint8_t flags;
+	void_fpt init_fpt;
+	flags = pgm_read_byte(&(cipher_descriptor->flags));
+	ctx->desc_ptr = cipher_descriptor;
+	ctx->keysize = keysize_b;
+	ctx->ivsize  = ivsize_b;
+	ctx->ctx = malloc(pgm_read_word(&(cipher_descriptor->ctxsize_B)));
+	if(ctx->ctx==NULL){
+		return 3;
+	}
+	init_fpt = (void_fpt)pgm_read_word(&(cipher_descriptor->init));
+	switch(flags&SC_INIT_TYPE){
+		case SC_INIT_TYPE_1:
+			((sc_init1_fpt)init_fpt)(key, ctx->ctx);
+			break;
+		case SC_INIT_TYPE_2:
+			((sc_init2_fpt)init_fpt)(key, iv, ctx->ctx);
+			break;
+		case SC_INIT_TYPE_3:
+			((sc_init3_fpt)init_fpt)(key, keysize_b, ctx->ctx);
+			break;
+		case SC_INIT_TYPE_4:
+			((sc_init4_fpt)init_fpt)(key, keysize_b, iv, ctx->ctx);
+			break;
+		case SC_INIT_TYPE_5:
+			((sc_init5_fpt)init_fpt)(key, keysize_b, iv, ivsize_b, ctx->ctx);
+			break;
+		default:
+			return 4;
+	}
+	uint16_t blocksize_b;
+	blocksize_b = pgm_read_word(&(cipher_descriptor->gensize_b));
+	if(blocksize_b>8){
+		ctx->buffer=malloc((blocksize_b+7)/8);
+		if(ctx->buffer==NULL){
+			return 5;
+		}
+		ctx->index=0;
+	}
+	return 0;
+}
+
+
+void scal_cipher_free(scgen_ctx_t* ctx){
+	if(ctx->buffer){
+		free(ctx->buffer);
+	}
+	if(ctx->ctx){
+		free(ctx->ctx);
+	}
+}
+
+uint8_t scal_cipher_gen_byte(scgen_ctx_t* ctx){
+	uint8_t flags;
+	uint16_t blocksize_b;
+	void_fpt gen_fpt;
+	flags = pgm_read_byte(&(ctx->desc_ptr->flags));
+	blocksize_b = pgm_read_word(&(ctx->desc_ptr->gensize_b));
+	gen_fpt = (void_fpt)(pgm_read_word(&(ctx->desc_ptr->gen.genvoid)));
+
+	if(blocksize_b==8){
+		if((flags&SC_GEN_TYPE)==SC_GEN_TYPE_1){
+			return ((sc_gen1_fpt)gen_fpt)(ctx->ctx);
+		}else{
+			uint8_t r;
+			((sc_gen2_fpt)gen_fpt)(&r, ctx->ctx);
+			return r;
+		}
+	}
+	if(blocksize_b<8){
+		uint8_t r=0;
+		uint8_t fill=0;
+		do{
+			r |= ((((sc_gen1_fpt)gen_fpt)(ctx->ctx))&(0xff<<(8-blocksize_b)))>>fill;
+			fill += blocksize_b;
+		}while(fill<8);
+		return r;
+	}else{
+		uint8_t r;
+		if(ctx->index==0){
+			((sc_gen2_fpt)gen_fpt)(ctx->buffer, ctx->ctx);
+			ctx->index = blocksize_b;
+		}
+		r=ctx->buffer[(blocksize_b-ctx->index)/8];
+		ctx->index -= 8;
+		return r;
+	}
+}
+
+void scal_cipher_gen_block(void* block, scgen_ctx_t* ctx){
+	uint8_t flags;
+	uint16_t blocksize_b;
+	void_fpt gen_fpt;
+	flags = pgm_read_byte(&(ctx->desc_ptr->flags));
+	blocksize_b = pgm_read_word(&(ctx->desc_ptr->gensize_b));
+	gen_fpt = (void_fpt)pgm_read_word(&(ctx->desc_ptr->gen));
+	if((flags&SC_GEN_TYPE)==SC_GEN_TYPE_1){
+		*((uint8_t*)block) = ((sc_gen1_fpt)gen_fpt)(ctx->ctx);
+	}else{
+		((sc_gen2_fpt)gen_fpt)(block, ctx->ctx);
+	}
+}
+
+void scal_cipher_gen_fillblock(void* block, uint16_t blocksize_B, scgen_ctx_t* ctx){
+	while(blocksize_B){
+		*((uint8_t*)block) = scal_cipher_gen_byte(ctx);
+		block = (uint8_t*)block + 1;
+		blocksize_B -= 1;
+	}
+}
+
+uint16_t scal_cipher_getBlocksize_b(const scdesc_t* desc){
+	uint16_t blocksize_b;
+	blocksize_b = pgm_read_word(&(desc->gensize_b));
+	return blocksize_b;
+}
+
+PGM_VOID_P scal_cipher_getKeysizeDesc(const scdesc_t* desc){
+	return (PGM_VOID_P)pgm_read_word(&(desc->valid_keysize_desc));
+}
+
+PGM_VOID_P scal_cipher_getIVsizeDesc(const scdesc_t* desc){
+	return (PGM_VOID_P)pgm_read_word(&(desc->valid_ivsize_desc));
+}
+
+